package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1 查询所有分类
        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);
        //2 组装成树形菜单
        List<CategoryEntity> level1Menus = categoryEntities.stream().
                filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map((item) -> {
                    item.setChildren(getChlidrens(item, categoryEntities));
                    return item;
                })
                .sorted((categoryEntity1, categoryEntity2) -> {
                    return null == categoryEntity1.getSort() ? 0 : categoryEntity1.getSort() - (null == categoryEntity2.getSort() ? 0 : categoryEntity2.getSort());
                })
                .collect(Collectors.toList());

        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前菜单是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public List<CategoryEntity> getLevel1Categorys() {
        List<CategoryEntity> categoryEntitys = baseMapper.selectList(new QueryWrapper<CategoryEntity>().eq("parent_cid", 0));
        return categoryEntitys;
    }

    private List<CategoryEntity> getChlidrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> chlidren = all.stream().filter(categoryEntity -> categoryEntity.getParentCid() == root.getCatId())
                .map((item) -> {
                    item.setChildren(getChlidrens(item, all));
                    return item;
                })
                .sorted((categoryEntity1, categoryEntity2) -> {
                    return null == categoryEntity1.getSort() ? 0 : categoryEntity1.getSort() - (null == categoryEntity2.getSort() ? 0 : categoryEntity2.getSort());
                })
                .collect(Collectors.toList());

        return chlidren;
    }
}